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-4f+9f+2=6+7f
We move all terms to the left:
-4f+9f+2-(6+7f)=0
We add all the numbers together, and all the variables
-4f+9f-(7f+6)+2=0
We add all the numbers together, and all the variables
5f-(7f+6)+2=0
We get rid of parentheses
5f-7f-6+2=0
We add all the numbers together, and all the variables
-2f-4=0
We move all terms containing f to the left, all other terms to the right
-2f=4
f=4/-2
f=-2
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